Bug, Can't create constraint over a Control Point Spline

[zmpXSM6L]

Hi, I created a simple Control Point Spline, than I Fix it .

Than i Created two perpendicular lines , one connected to the Spline

When I try to create a constraint between point "A" and point "B"

Fusion says it's overconstrained. But it's not!

Those two perpendicular lines should be moving along the Spline freely without the constraint,

It does actually move but with some trouble.

When using a Fit Point Spline this works fine!

[JamieGilchrist]

hi  zmpXSM6L,

your spline is green, which means it has been locked.  Select the spline and unlock it and see if that resolves the over-constrained error.

[zmpXSM6L]

Hi, yes it's locked and that's the way it should be.

If I turn the lock off, it will not throw an overconstrained error anymore, but it will move the entire spline as I change the dimension constraint, and that's not the behavior I expect.

As I said, it works fine with a Fit Point Spline

The two perpendicular lines move along the path of the spline.

If I create the constrain before locking the spline an than I lock the spline I can't change the constraint, it throws an error "Fail to Solve"

[jeff_strater]

@zmpXSM6L - this looks like a bug to me.  I will try to re-create it, but if you want to share your design here, I can make sure that this case gets attention.  Thanks for posting.

[edit] Actually, I had similar problems with a fit point spline.  In both cases I could drag the line construct a bit, but it would soon stop.  And, in both cases, if I tried to create, say, a horizontal constraint with the endpoint of the line and one of the locked spline points, I got an overconstrained error.  So, if you can share your design, and show a video of  it working for fit point splines and not for CV splines, that would be very helpful

[jeff_strater]

I can reproduce the issue on my end, but it seems to happen equally for fit point and CV splines.  I've created bug FUS-60631 to track this.

[zmpXSM6L]

Hi Jeff, I have recorded an screencast describing both behavior(the right and the wrong)

 

[jeff_strater]

Thanks.  One thing I discovered while creating the bug is that the culprit seems to be the horizontal constraint on the line that connects to the spline.  In both cases, the drag works if I remove the horizontal, and is glitchy, at best, with the horizontal applied.  I tested with closed splines, not sure if that makes a difference or not.

[zmpXSM6L]

For me a Closed Spline no Matter which type causes the same bug. Only a open Fit Point Spline works as expected